Simulation and computational study of U-mold membrane components by CFD multiphase flow Euler model

Abstract

When treating waste water with MBR system, the function of membrane module is to filter suspended solids (SS) in sewage. In the MBR waste-water treatment system, due to the U-shaped hollow fiber membrane module is one of the commonly used membrane modules, the CFD multi-phase flow Euler model is used to simulate and calculate the U-type hollow fiber membrane module in this paper. In the research process, the geometric model of the single U-shaped membrane tube was firstly established by ICEM CFD pre-processor, and structured meshing this geometric model. Then set the FLUENT solver to calculate the mesh file and monitor the volume fraction of the SS at the exit of the geometry model. Because the research object of this paper is solid-liquid separation, the multi-phase flow Euler model is enabled in the solver. Finally, the calculation result is graphically presented by the CFD-Post post-processor. On this basis, this paper selects the sewage with different SS concentration for experimental analysis: we use the SS concentration of waste-water as the secondary boundary condition of the solver to calculate, and compare the calculation results with the MBR system operation results in actual production. The comparison results show that the volume fraction of SS at the exit of U-shaped membrane tube is almost zero after calculation by the solver, which is basically the same as the actual MBR system. It solves the problem of using CFD to simulate U-shaped membrane module to filter sewage process, and has certain reference value for MBR simulation research.